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2015 ; 16
(5
): 11276-93
Nephropedia Template TP
gab.com Text
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English Wikipedia
Adventitial Tertiary Lymphoid Organs as Potential Source of MicroRNA Biomarkers
for Abdominal Aortic Aneurysm
#MMPMID25993295
Spear R
; Boytard L
; Blervaque R
; Chwastyniak M
; Hot D
; Vanhoutte J
; Staels B
; Lemoine Y
; Lamblin N
; Pruvot FR
; Haulon S
; Amouyel P
; Pinet F
Int J Mol Sci
2015[May]; 16
(5
): 11276-93
PMID25993295
show ga
Abdominal aortic aneurysm (AAA) is an inflammatory disease associated with marked
changes in the cellular composition of the aortic wall. This study aims to
identify microRNA (miRNA) expression in aneurysmal inflammatory cells isolated by
laser microdissection from human tissue samples. The distribution of inflammatory
cells (neutrophils, B and T lymphocytes, mast cells) was evaluated in human AAA
biopsies. We observed in half of the samples that adventitial tertiary lymphoid
organs (ATLOs) with a thickness from 0.5 to 2 mm were located exclusively in the
adventitia. Out of the 850 miRNA that were screened by microarray in isolated
ATLOs (n = 2), 164 miRNAs were detected in ATLOs. The three miRNAs (miR-15a-3p,
miR-30a-5p and miR-489-3p) with the highest expression levels were chosen and
their expression quantified by RT-PCR in isolated ATLOs (n = 4), M1 (n = 2) and
M2 macrophages (n = 2) and entire aneurysmal biopsies (n = 3). Except for the
miR-30a-5p, a similar modulation was found in ATLOs and the two subtypes of
macrophages. The modulated miRNAs were then evaluated in the plasma of AAA
patients for their potential as AAA biomarkers. Our data emphasize the potential
of miR-15a-3p and miR-30a-5p as biomarkers of AAA but also as triggers of ATLO
evolution. Further investigations will be required to evaluate their targets in
order to better understand AAA pathophysiology.